Someone that holds significant resemblance to a single-celled organism in terms of intelligence or rather, the lack of it.
Generally used when they have just done something insanely stupid/useless/both.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.